作者: David L. Clark
DOI: 10.1038/300321A0
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摘要: During the Cenozoic, an open water Arctic Ocean changed to modern permanently ice-covered condition. Significant world climate modification accompanied this change but precise role of in major Pleistocene events is controversial. The present ice-cover averages 3 m thickness there are theories that during it was Antarctic-like, several thousand metres thick. time origin placed as young 0.7 Myr ago and old middle Miocene. Any theory concerned with origin, nature climatic response must consider ocean's sediment record.